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39890 Bobstephens (1998 FA3)
Classification: Main-belt Asteroid          SPK-ID: 2039890
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2173164118991704 4.9295e-08  
a 2.590367795126338 1.211e-08 au
q 2.027438360390317 1.2457e-07 au
i 5.496154866614098 4.3501e-06 deg
node 161.6970218655198 5.4318e-05 deg
peri 95.63492573699689 5.5235e-05 deg
M 77.94010977230761 9.7471e-06 deg
tp 2458670.815076490815
(2019-Jul-06.31507649)
4.1703e-05 TDB
period 1522.791959236838
4.17
1.0678e-05
2.923e-08
d
yr
n .2364078676777473 1.6578e-09 deg/d
Q 3.153297229862359 1.4741e-08 au
  Orbit Determination Parameters
   # obs. used (total)      595  
   data-arc span      9150 days (25.05 yr)  
   first obs. used      1995-10-26  
   last obs. used      2020-11-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60609  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:41:22  

Additional Information
 Earth MOID = 1.02155 au 
 Jupiter MOID = 1.93714 au 
 T_jup = 3.380 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO493127  
rotation period rot_per 9.55 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Coley, D. (2012) Minor Planet Bull. 39, 23-24.]

39890 Bobstephens           Discovered 1998 Mar. 23 by P. Pravec at Ondřejov.
Robert Stephens (b. 1955) is a Californian amateur astronomer who has determined some 30 sets of minor-planet lightcurve parameters since becoming active in the field in 1999. His high-quality work and generosity in sharing his time and knowledge within the amateur community have set a standard for others to follow.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020724/MPCPages.arcLast Updated: 2003-10-02

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1929-Jun-12 03:02 00:02 Jupiter 1.9179451141583 1.91794469260988 1.91794553570671 1.6499231794137 1.35609220378503 2425774.626153995 1.66437517442629 109.557655508408 75.7288215641415 49.079448140833 1523722.81813463 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 03:41:24 2020-Dec-18 03:41
2000-Apr-09 01:29 < 00:01 Jupiter 1.95558631510688 1.9555858719232 1.95558675829033 1.966961590097 1.73282384997805 2451643.562085457 0.340413612800198 45.0575115868651 36.120040756452 71.0879738479088 1697034.70106922 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 03:41:24 2020-Dec-18 03:41
2013-Apr-23 07:29 < 00:01 Jupiter 1.9880324066417 1.98803199330456 1.98803281997839 1.54316089097766 1.2366180082012 2456405.811648999 0.169706416154453 87.164422214929 59.9293258429192 -5.95623604120138 1784199.90014373 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 03:41:24 2020-Dec-18 03:41
2084-Feb-18 21:31 00:01 Jupiter 1.93845542900513 1.93845503926418 1.93845581874565 1.46639990794691 1.12978485395245 2482274.396725462 1.34471326394321 144.830956055946 72.6777126279306 10.5834411272713 1527514.75355832 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 03:41:24 2020-Dec-18 03:41
2154-Dec-18 10:00 00:03 Jupiter 1.92994576037978 1.9299452092443 1.92994631151439 1.58765776201881 1.28175230107166 2508143.916471559 2.70511759761528 209.175655439228 62.1517872125263 31.7257273262317 1296950.36860633 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 03:41:24 2020-Dec-18 03:41
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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